package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    /**
     * 前置通知
     *
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Exception {
        log.info("开始进行数据填充...");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class); //获得方法上的注解对象
        OperationType operationType = autoFill.value(); //获得注解上的操作类型

        //获取到当前被拦截的方法的参数
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }

        //统一指定数组第一个为目标对象
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now(); //当前时间
        Long currentId = BaseContext.getCurrentId(); // 操作人id

        if(operationType == OperationType.INSERT){
            Method  setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method updateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method updateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            setCreateTime.invoke(entity, now);
            setCreateUser.invoke(entity, currentId);
            updateTime.invoke(entity, now);
            updateUser.invoke(entity, currentId);
        }else if(operationType == OperationType.UPDATE){
            Method updateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method updateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            updateTime.invoke(entity, now);
            updateUser.invoke(entity, currentId);
        }
    }
}
